In general a primary TKA is a durable and well-functioning solution with a 10-year implant survival of more than 90 %. However, new techniques are developed and the patients´ demands for increased durability of the implants are increasing. It is believed that the new implant Regenerex, planned to be tested in the present study, with the new surface coating will facilitate bone ingrowth and secure a better fixation to the host bone, thus increasing the implant survival and improving the function of the prosthesis.